John Hennessey told US car blog Jalopnik that he ran into Texan Lt Governor David Dewhurst and mentioned that he'd be able to supply a couple of quick cars to help test the TxTag toll system on the SH-130 before it opened last month.

The politician had a chat to the Transportation Department, and the result was Hennessy's twin-turbo 7-litre, 913kW (1226hp) Cadillac CTS-V VR1200 flying past the cameras about as quickly as you could ever do it.

And then, for good measure, he did it in his Camaro - allegedly the fastest ZL1 in the world, at 328km/h - just in case.

The plate reading system worked, capturing front and rear licence plates at around 180mph (289km/h).

"This was a win-win for our company as well as the state and TxDOT," the tuning legend told Jalopnik.

"I am truly proud to be a Texan and from a state that has the best highway system in America. We also have some of the best people who work together to get things done!"